Spinosuncus aureolalis has a large wingspan (more than 26 mm). The ground colour of the wings is the darkest within the genus. Though S. aureolalis has a similar wingspan as S. praepandalis, it can be distinguished by the sinuate but not thickened anterior part of the postmedial line of the forewing near costa and the smooth, not dentate wing lines. In the male genitalia, it is characterized by the uncus distally with two large spines, the cheliform sacculus projections, and the fin- and needle-shaped setae forming editum on the sella distally (as in S. quadracutus). In the female genitalia, the two large, hook-like notches anterolaterally on the sinus vaginalis and the laterally broad, granulated antrum (as in S. quadracutus) are diagnostic. The appearance of S. aureolalis is most similar to that of S. quadracutus, both having the same wing pattern. The differences between these two species are given in the diagnosis of S. quadracutus.